Nippon Piston Ring Co., Ltd.

Mitsui Engineering and Shipbuilding Company Limited

Takao Omiya

Tetsuo Masuyama

Yoshikatsu Nakamura

Osamu Kawamura

Hiroshi Takiguchi

Takasumi Kubo

Toshiaki Sato

Takeshi Aizawa

Kunihiro Iguchi

Masahiro Kimura

Takayuki Goto

The present invention provides a synchronizer ring excellent in strength and abrasion resisting property, used in a speed change gear. This synchronizer ring according to the invention is consisted of, by weight, C:0.2&tilde;1.0%, Ni:1.0&tilde;6.0%, Mo:0.6&tilde;3.0%, Cu:1.0&tilde;4.0% and the reminder Fe and inevitable impurities, and is made of Fe sintered alloy of which base composition comprises of mainly martonsite and bainite. And the base composition is preferably consisted of, by volume, martensite: 57&tilde;80%, bainite: 17&tilde;40%, austenite: 8% or less.

Synchronizer ring

A synchronizer ring performing synchronous sliding operation with and separating operation from a rotating object member, is composed of an Fe sintered alloy. The Fe sintered alloy comprises carbon of from 1.2 wt. % to 2.0 wt. %, copper of from over 15.0 wt. % to 25.0 wt. %, and the balance being iron and incidental impurities. A free Cu phase is precipitated in a matrix of the synchronizer ring. The synchronizer ring has a high scuffing resistance, an excellent friction characteristic, and sufficient abrasion resisting property and strength, and moreover, provides an easy manufacture thereof by means of a size working and is stable in quality.

A synchronizer ring having a stabilized friction characteristic relative to a taper cone and having sufficient mechanical strength and anti-abrasion characteristic. The synchronizer ring is made from a ferrous sintered alloy containing 0.2 to 1.0% by weight of carbon, 8.0 to 15.0% by weight of copper, 0.1 to 7.0% by weight of at least one component selected from a group consisting of chromium, manganese, molybdenum, and phosphorus, and balance iron and inevitable impurities. A free copper is precipitated in a matrix of the sintered alloy. Porosity of the sintered alloy is from 3 to 8 vol %.

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Tochigi-ken, Japan

Takao Omiya